Mask



hmmm

F. R M. BULMEIFQ MASK @ma July 24, 1929 Patented Sept- 20,` 1932 Y' Y UNITED STATES;

Y FREDERICK R. M. BULMRR, or TORONTO, oNTARIocANAnA' i MASK l Application filed July 24', 1929. Serial No. 380,580.

` ln certain trades or callings, for example, granite workers, brass finishers, kworkmen using poisonous gasesor the like, the health of the workmen is endangered through the inhaling of granite dust, fine particles of quickly applied or removed, and which al' Vlows the wearer to talk or expectorate complete removal of the mask. v

AI attain my object by Vconstructing `the mask of a light flexible material and of Sudicient size to hold a considerable quantity of air when in position on the face. The mask is provided with kan air inlet and one or more without outlets. Air is supplied vto the mask from a suitable source at a rate sufficient tomaintain the mask in an inflated condition, so thaty while the mask remains inflated the wearer may know that theV mask operating Vsatisfactoril The' mask is constructed in detail substantially as hereinafter described and illustratedVV in the accompanying drawing in which V:- 4 Figure 1 is a side elevation, partly broken away of the-mask; and

ares

Figure 2 a front view of the same..l

In the drawing like numerals of reference indicate corresponding parts in the different figures. L l p vThe body of the mask is roughly-of segmento ,spherical form and is preferably formed of a porous fabric Vl preferably covered by oiled silk 2 or other nonpo'rous material provided with gaps or 'openings 3 for* the escape of air. The mask, it will be seen from the drawing is intended to cover only the nostrils and mouth leaving the eyes and upper part of the faceexposed.

The upper edge of the mask is pro-vided 'with ahem 4 and in-this-hem is placed a U shaped member 5 adapted to hold the upper'edge of the mask about the nose. Also threaded-through the hein is a tie cord 6 for securing the `mask in position.` I lindbest re'- sults are'obtained-if this tie cord 'be'V made y of piece of rub-ber tubing, as the and unfastening is facilitated; l p t ,Therear edge of thejmask has stitched fastening therein lan elastic strip l0 by means of which therear' edge of the ,mask 'is gathered to hold-y the same resiliently against thevsides Y' of the face and the under side of the chin. A fitting 'is provided to'which a hose '8 may be attached for Athesupply of "airQ To the inner end of 'this fitting is connected'a fabric bag 9, which being porous, allows the air to enter the mask, but 'acts as a' diffuser so that thewearer does'not receive a blast of air directly from the hose. It also acts as a filter to prevent the entrance of dirt.

The mask is secured in place as indicated y in the drawing and the hose 8 connected with the air supply (not shown). Air may escapel through the gaps or outlets 3 and possibly also a certain amount will escape about the .edgesl of themask which 'is a desirable feature Vin h'ot weather as it prevents chafing of the face. The air will be supplied, however, at a rate sufficient to maintainthe mask in an inflated or bellied .out condition, thus enabling the luser to tell whether the mask is operating satisfactorily. As the air is supplied to the mask at a rate to keep rit inflated,

there will be no inflow of air around the edges of the mask or throughthe outlets 3;

The wearer may talk while the maskis in position, or if he wishes to expectorate he`l` may graspv the mask belowthe chin and stretching the elastic strip V6, theV lower part l of the mask may be temporarily moved out;

` ofV position. 4

It will be evident of course, that various modifications in the details of construction are possible. For example the mask may be `of all non-porous materia-1 and simply pro-- vided with -a restricted outletsimilar to the inlet shown. The mask might also bel provided with an upward extension'provided- `with goggles for the protectionof the eyes. From the above description it willbe seen that Ihave devised a: maskfwhich will satisvfactorily attain the object of my invention as i' set out in the preamble of this .speeieation What I claim as my invention is r LA face mask of roughly segmento Y spherical form comprising a body portion Y l formed from flexible sheet material adapted b spherical form comprising a body portion formed from flexible sheet material adapted Y to be tted over the mouth and nostrils of the wearer 'and provided with an air supply eonnection; means for securing'therupper margin of said mask snugly about the head; and resilient means for holding the rear margin of said mask snugly againstfthesides of thev face and .under sidel of the chin,v said; Y i d. maskbeing arranged to permit only a re"-vv stricted escape of air whereby the mask may be maintained in inflated icondition."'A Y Q-A facel maskfof roughly" segmento 'robe iitted over the mouth and nostrils of the wearer and provided with an air supply connection; a tie of lexibletubing for KVthe up- Y per margin of said mask for securing it 'Y of the Chin, said mask being arranged to permit only a restricted escape of air whereby the mask may be maintained inginiated snugly aboutvthehead; and meansfor holding the rear margin of said mask resiliently against `the sides of therface and under side condition. y

Signed at Toronto, Ontario, this :17th j of July, 1929. 1 FREDERICK -sp L 

